Files



UNITED STATES PATENT OFFICE.'

CHARLES MILLER, 0F NEWT YORK, N. Y.

CUTTING FILES.

Specification of Letters Patent No. 16,064, dated November 11, 1856.

To all whom t may concern.'

Be it known that I, CHARLES MILLER, of the city, county, and State ofNew York, have invented a new and useful Improvement in Machinery forCutting Files; and I do hereby declare that the following is a full,clear, and eXact description of the same, reference being` had to theaccompanying drawings, forming part of this specification, in which-Figure l, is a longitudinal vertical section of a file cutting machinewith my improvement. F ig. 2, -is a front elevation of the same.

Similar letters of reference indicate corresponding parts in bothfigures.

This invention consists in a certain contrivance for regulating theoperation of the chisel for the purpose of producing a uniform depth ofcut from end to end of the file.

To enable others skilled in the art to make and use my invention, I willproceedlto describe its construction and operation.

A, is a stationary table containing ways for a horizontal slidingcarriage B. This carriage B, has a cavity in its upper surface which isto be lined at the bottom with some sufficiently soft metal to serve asa bed for the file blank to rest in during the cutting operation, saidcavity or bed being of such length, width and form as to prevent thefile blank moving longitudinally or laterally during the cuttingoperation. A file blank is represented on the carriage B, in both viewsin red outline.

C, is an endless screw working in fixed bearings inthe end of the tableA, and fitting to a nut D, secured under the carriage B, for the purposeof moving the carriage to feed the file blank to the chisel.

E, is a strong bridge piece striding across and firmly secured to thetable A, to support the fixed guide F, to which is fitted the chiselstock G, said guide being inclined backward from the bottom upward, tothrow forward the lower end of the chisel. The bottom of the chiselstock is required to rest upon the upper face of the file blank duringthe cutting operation and in order to keep it firmly in contacttherewith the chisel stock is connected with the guide F, by means oftwo springs b, o, which hold it down but at the same time permit it torise over the curved surface of the file blank as the latter moveslongitudinally under it. The bottom I )I n y, i y

part of the stock which rests on the iile blank is made narrower thanthe narrowest file intended to be cut in the machine so that it may notproject beyond the edges of the file blanks.

H, is the chisel which is lit-ted to slide up and down in a groove inthe front of the stock G, and is confined in place by two cross piecesc, c, secured to the stock. The chisel is moved upward to prepare tostrike the file blank to produce the cutting operation, by means of acam I, on a rotating shaft J, which works in bearings in the bridgepiece E, said cam operating on the under side of a stud (Z, which issecured to the back of the chisel and passes through a slot in the backof the stock G. The descent of the chisel to strike the blow, isproduced after the point of the cam passes the stud el, by the action ofa spring e, which connects itwith the lower crosspiece c. The shaft J,carries another cam I, which operates to depress a lever M, to which isattached a pawl N, engaging with a ratchet wheel O, on the end of thescrew C. The depression of the lever M causes the pawl N, to give motionto the ratchet wheel and thus move the screw to produce the feed motionof the carriage. The lever M, is raised again after the action of thecam by means of a spring P. The cams must be arranged ,so that the feedtakes place while the chisel is stationary.

K, is a. screw screwing directly into the head of the chisel H, andprovided with abroad-flanged nut or collar f, which, when the chiselstrikes its blow, comes in cont-act with the t-op of the stock G, whichserves as a stopl thereto and thus serves to prevent the furthermovement of the chisel and hence regulates the depth of cut. The depthof cut may be varied, by screwing the nut K, farther into or out fromthe chisel head and using a collar at f, that is immovable on the screw,or b-y employing a nut at f, to screw up higher or down lower and havingthe screw immovably attached to the chisel head.

It must be observed that the left of the cam must be sufficient to givethe chisel a sufficient amount of fall to cut to the required depth onthe thickest or highest part fectly uniform from end to end of the le,Whatever may be its form in a longitudinal direction. This result is themost difficult of all to obtain in cutting files and upon its perfectionthe good quality of the file in a great measure depends.

Instead of having the stock G, rest directly upon the file blank it mayrest. upon a pattern or patterns of corresponding form attached to thecarriage on one or both sides of the file blank. I do not contemplateusing any such arrangement, as it is more complicated, less reliable,and altogether inferior to the arrangement of the stock to rest on thefile-blank itself, but mention it to show that the principle of theinvention is capable of modification.

I do not claim the mere employment of a stop to regulate the depth ofcut of the chisel. But

What I claim as my invention and desire to secure by Letters Patent, is

Fitting the chisel to Work in a stock which rests upon t-he file blankitself or on a pattern of similar form moving With it 25 throughout theWhole length of the movement of the blank under the chisel, and servesas a stop to the chisel, Substantially as and for the purposes hereindescribed.

CHARLES MILLER.

Witnesses:

W. TUscH, JAMES F. BUCKLEY.

